Improvement in electro-motor escapements



1T. A EDISON.

I ELEOTROMOTQR BSCAPEMENT.. "N 0L1'03,035. v V Patented MaJy 17,1870.

Wham; Q Invenl -b v M um.

To all whom it mag concern mu (Militia.

THOMAS A. unison, or vnw YonK, N. v.

Leiters Patent lvo. 103,035,!iatc1l1ifdg 17, 1370.

IMPROVEMENT 11v Rename-MoronnscArnmnu'rs.

The Schedule referred to in thes e Letters Patent and making part of the same Be it known thatl, THOMAS A.Eo1sox,ot' the city of New York, in the county and State of New York, have invented certain new and useful Improvements in Elcctro-motonEscapements; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being hadto the accompanying drawing, which forms part of this specification. f p

The object-of this-invention is to provide a novel and efficient means whereby an intermittent rotary motion in onedirection may be communicated to a wheel and shaft by the vibrations of the armature of an electro-m agnet, while, at'the same time, by simply suspending the action of-tl1e electro-magnet, the said 7 wheel and shaft may be securely held at any desired point in its revolution.

In the accompanying drawing, which is a front olevation of my invention- Afdesignates a wheel mounted upon ashaft, (l, and provided with ratchet-shaped teeth upon its periphery.

B is a forked lever, which is movable upon the pivot or arbor b, and is provided with two spring-pawls or clicks, 0 and D, whiohengage with the teeth of the wheel A at twoopposito points or sides of its periphery. a

E and F are stops secured to or formed upon the forked lever B, and thesestops are so arranged as to actalternately at opposite points upon the teeth of the wheel A, as will be hereinafter described.

G is an electro-magnet, the armature, H, of which is secured to the lever B.

S is a retracting spring, which retains the lever B in the positionshown in the drawing, when the electro-' magnet G is not in action.

The manner in which this device operates is as follows:

lien in currentot' electricity passes through the w (oil of the electro-magnet G, its attraction for the ar-;

mature H causes the lever B to bemoved toward said magnet. i

l lie pawl or click engages with a tooth of the who! A, and causes it to revolve, in the direction shown by the black arrow, until its motion is arrested by the stop 15 coming in contact with another of its tccth, as shown in the drawing. The click D at the same time slips over one toot-h of the wheel A.

When'thc electric current is interrupted,ltho attractive force of the clectro-magnet G is no longer exerted lllmn the armature H, and the spring 8 causes the lever B to return to its normal position.

During the lattcrmovement, a reverse action takes place. by means of the click D and the stop F, the effect ot which is to advance the wheel A still further in the Same direction as before. This action may he repeatedindefinitely, and an intermittent rotary motion communicated to the. wheel A by the vibration of the armature H of the 'electro-magnet G.

When the lever 13 is at rest at either extremity of its vibration, one of the stops E or F rests between .two teeth of the wheel'A, thus holding-it in the desired position until. the lever is again moved.

The ratchet wheel and escapement, when arranged as described, may be placed upon a shaft midway be tween the bearings of said shaft, without necessarily being placed close to the frame, in. order to accommo datethe stops. In the construction and operation of printing and dial-telegraphs this is often a great advantage. f

Thisimproved cscapeinent has several important advantages over those employing rigid pawls or clicks, pivoted or hinged to the, lever of the armature, and having screw-stops attached to the frame; for instance, the jarring andvibrating caused by the rapid movements of the lever in such above-referrcd-to devices, has atcndeno'y to continually loosen the pivots out of adjustment, by the loosening of any of the parts,

is entirely obviated.

armature H, substantially as and for the purposes herein specified.

' 3. The combination with an electro-magnet, G, of

a vibrating lever, B, provided with thestops E F; one or both, and clicks 0 D, one or both, arranged and operating substantially as herein specified.

. 4. The combination.- of the clicks 0 and D, stops'E and F, lever B, spring S, toothed wheel A, armature H, and electroema-gnet G, substantially as and for the purpose herein specified.

THOMAS A. EDISON.

Witnesses:

M. M. Liv'nrosrox, FRANK L. 1orn.- 

